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Latrodectus mactans, known as southern black widow or simply black widow, and the shoe-button spider, [citation needed] is a venomous species of spider in the genus Latrodectus. The females are well known for their distinctive black and red coloring and for the fact that they will occasionally eat their mates after reproduction.
The Australian funnel-web spiders (family Atracidae), such as the Sydney funnel-web spider Atrax robustus (a mygalomorph spider, not to be confused with the araneomorph funnel-weaver or grass spiders) are regarded as among the most venomous in the world. They react vigorously to threats and, reputedly, will more often attempt to bite than run away.
Other spiders in western states that might possibly cause necrotic injuries are the hobo spider, desert recluse spider, and the yellow sac spider. For example, the venom of the hobo spider , a common European species now established in the northwestern United States and southern British Columbia , has been reported to produce similar symptoms ...
The recluse spiders (Loxosceles (/ l ɒ k ˈ s ɒ s ɪ l iː z /), also known as brown spiders, fiddle-backs, violin spiders, and reapers, is a genus of spiders that was first described by R. T. Lowe in 1832. [4] They are venomous spiders known for their bite, which sometimes produces a characteristic set of symptoms known as loxoscelism.
Argiope aurantia is a species of spider, commonly known as the yellow garden spider, [2] [3] black and yellow garden spider, [4] golden garden spider, [5] writing spider, zigzag spider, zipper spider, black and yellow argiope, corn spider, Steeler spider, or McKinley spider. [6] The species was first described by Hippolyte Lucas in 1833.
Latrodectus hesperus, the western black widow spider or western widow, is a venomous spider species found in western regions of North America. The female's body is 14–16 mm (1/2 in) in length and is black, often with an hourglass-shaped red mark on the lower abdomen. This "hourglass" mark can be yellow, and on rare occasions, white.
A female of A. hentzi can lay up to 1,000 eggs. [4] The eggs are positioned securely in a web shaped like a hammock, [4] which remains in her burrow, and guarded by her. Eggs hatch in 45 to 60 days.
Sicariidae is a family of six-eyed venomous spiders known for their potentially necrotic bites. The family consists of three genera and about 160 species . Well known spiders in this family include the brown recluse spider and the six-eyed sand spider .